-er b-u bbb bbe bbg bbk bbl bbr bbs bbu be- beb bee beg bek bel ber bes beu bgb bge bgg bgk bgl bgr bgs bgu bkb bke bkg bkk bkl bkr bks blb ble blg blk bll blr bls blu brb bre brg brk brl brr brs bru bsb bse bsg bsk bsl bsr bss bsu bub bue bug buk bul bur bus buu ebb ebe ebg ebk ebl ebr ebs ebu eeb eee eeg eek eel eer ees egb ege egg egl egr egs egu ekb eke ekg ekl ekr eks eku elb ele elg elk ell elr els elu erb ere erg erk erl err ers eru es- esb ese esg esk esl esr ess esu eu- eub eue eug eul eur eus gbe gbg gbk gbl gbr gbs gbu ge- geb gee geg gek gel ger ges geu ggb ggg ggr ggs ggu gkb gks glb gle glg glk gll glr gls glu grb gre grg grk grl grr grs gru gsb gse gsg gsk gsl gsr gss gsu gu- gub gue gug guk gul gur gus guu kbb kbe kbk kbl kbr kbs kbu ke- keb kee keg kek kel ker kes kgb kgl kgs kgu kkb kke kkk kkl kkr kks kku kl- klb klg klr kls klu krg krk krl krr krs kru ksb kse ksg ksk ksl ksr kss ksu kub kue kug kuk kul kur kus kuu lbb lbe lbg lbk lbl lbr lbs lbu leb lee leg lek lel ler les leu lgb lge lgg lgk lgl lgr lgs lgu lkb lkg lkl lkr lks llb lle llg llk lll llr lls llu lrb lrg lrk lrr lrs lru lsb lse lsg lsk lsl lsr lss lsu lub lue lug luk lul lur lus luu rbb rbe rbg rbk rbl rbr rbs rbu re- reb ree reg rek rel rer res reu rgb rge rgg rgk rgr rgs rkb rke rkg rkk rks rku rle rlg rll rlr rls rlu rrb rrg rrk rrl rrr rrs rru rsb rse rsg rsk rsl rsr rss rsu rub rue rug ruk rur rus ruu sbb sbe sbg sbk sbl sbr sbs sbu se- seb see seg sek sel ser ses seu sgb sge sgg sgk sgl sgr sgs sgu sk- skb ske skg skk skl skr sks sku slb sle slg slk sll slr sls slu sr- srb sre srg srk srl srr srs ss- ssb sse ssg ssk ssl ssr sss ssu sub sue sug suk sul sur sus suu ubb ube ubg ubk ubl ubr ubs ubu ueb uee ueg uel uer ues ugb uge ugg ugk ugl ugr ugs ugu ukb uke ukk ukl ukr uku ulb ule ulg ulk ull ulr uls ulu ur- urb ure urg urk url urr urs uru usb use usg usk usl usr uss usu uue uug uur uus uuu